Harold Kestenholz
Heat is a special sub-branch of plumbing that follows the same rules of plumbing. Not ALL plumbers understand the physics of height, pressure, and flow, so operation might be noisy. The procedure for setting pressure and eliminating air is at http://www.hydronicnetwork.net
The plumber would do better taking care not to allow tubing to rub against surfaces so the expansion would take place quietly. Some cutting and patching may allow access to make the holes around the tubing larger with hangers and insulation applied to keep the metal away.
